Syndicate Enforcer is a common Creature — Human Rogue card from Gatecrash (GTC), collector number 80. Current market price: $0.12 (foil $0.29), TCGplayer market prices via Scryfall.
Extort (Whenever you cast a spell, you may pay {W/B}. If you do, each opponent loses 1 life and you gain that much life.)